Solar collectors is a device for conversion of solar energy into thermal . Heat of the sun heats the black surface of the collector. Energy transfer to the tube with the liquid takes place at a very large distance, as a result of which problems with heat exchange at low densities and varying the energy flow. For the region Slovak Republic is the total hours of sunshine, ie without a cloud, 1600 – 2001 hours per year.
Vacuum tube collectors produce energy even in the diffuse (indirect) solar radiation. The tube absorption surface impinging sun rays during the day vertically, thus giving a conversion of the maximum amount of solar radiation into heat energy and the law in this respect, vacuum tube collectors have no competition on the market. Collector vacuum insulation layer prevents the cooling of the collector wind or other weather it therefore works with this type of collector maximum gains and minimum loss.
Heating tap water
Support for heating of buildings
Heating water in pools
When sizing a solar device production of hot water is the aim of achieving the highest possible level as coverage of consumption outside of the heating season, so during this period it had to use another heating energetic way. After determining hot water consumption and during its consumption is possible to cover 50 – 70 % of the annual cost of heating water.
solar collectors, but can not cover the full energy consumption to heating a house even at the enlarged area compared collectors collector to heat the water. Thus resulting heat can cover about 15 to 30 % of the annual needs of a well-equipped isolated object low temperature heating system.
Viability solar system is currently in the range 25 – 30 years. The costs of procurement and installation of the entire solar system depends on the particular situation (the number and location of collectors, the volume of the container, the length of connecting pipes and the like.) Are amounting to € 4,000. The operating costs of solar collectors are minimum, include the consumption of electricity to drive the circulation pump with a power of 25 – 40 watts for about 6 € / year and the exchange of heat transfer liquid once every 6 – 10 years, amounting to around € 100. Height saving energy costs depends, for example annual production of heat achieved by exploiting solar system, as well as the price of energy in the prior process of heat production.
When optimally designed system, solar collectors, it can save up to 50 – 70 % of the energy needed to heating hot water .
An average value that is 60 % multiplied by the amount of energy required to heat the hot water, respectively, the cost of this energy, the resultant sum corresponds to the height savings. In our example modeled in four member household consumed 300 l of hot water per day. Within the solar system were installed two collectors with a 3.7 m² at a price of 3,000 euros. Furthermore, the solar system is employed in family house and electricity or natural gas.
In the case of the initial preparation of hot water through a boiler on natural gas with 89 % efficiency, household annually consumes 490 cubic meters of natural gas, for which will pay over 400 euros. After installing a solar system, It costs will drop to around 150 euros. Should an equal amount of hot water were prepared in an electric boiler, a year to prepare a household consumes 6,200 kWh of electricity, what would it cost around 560 euros. After you install the solar system, in this case, costs will drop to 230 euros. Sumy and the quantities are approximate diameter on a four member family.